On another board, @DerekhHikmah asked: "And the diamond body, the text mentions it in the beginning, what do you take that to be exactly?"
That conversation has yet to fully to unpack itself, but I thought I'd throw in some stuff here. In utilising a search engine, I found a lot of stuff thrown up which is derivative if not fanciful – a lot of opinion, but rarely based on direct reference. So I though I'd stick to search-engine generic answers, and hope that someone more critically informed might add in.
The Diamond Body
In Buddhism, the vajrakaya symbolizes an indestructible, enlightened form that transcends physical limitations and duality. It represents the pure, luminous nature of reality and the practitioner's potential to realize an immortal, subtle body through advanced meditative and tantric practices. Known as the Diamond Vehicle in Vajrayana Buddhism, the culmination of practice, achieved through vajrasattva yoga and tantric visualization. It is described as a celestial body beyond dualities, formed by purifying the physical and subtle bodies until they become transparent and luminous like crystal.
In a broader Mahayana contexts, the diamond body signifies a Buddha's indestructible state, free from corporeal needs, such as food, etc. It is closely linked to the Diamond Sutra Vajracchedika, which uses the diamond metaphor to describe wisdom that cuts through delusion and conceptual attachments.
Rainbow Body
In Tibetan: jalü or 'ja' lus, is the spiritual attainment in the Tibetan Dzogchen (Great Perfection) Tradition, wherein the physical body dissolves into pure light at the time of death. This signifies liberation from samsara.
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Equivalences can be drawn between the two, and from a number of other traditions:
St. Paul spoke of the spiritual body (soma pneumatikon) in 1 Corinthians 15:40.
Sufism speaks of "the most sacred body" (wujud al-aqdas) and "supracelestial body " (jism asli haqiqi).
In Vedanta, "the superconductive body."
Building on concepts by Iamblichus and Plotinus, the late Neoplatonist Proclus (5th century CE), credited as the first to speak of subtle or astral (starry) planes, posited two subtle bodies, vehicles, or 'carriers' (okhema), between spirit and the physical body. These were the augoeides okhêma, 'luminous vehicle' / 'body of light', the immortal vehicle of the rational soul, and the pneumatikon okhêma, 'pneumatic vehicle' / 'body of breath' (the indwelling vital breath pneuma) which he identified as the mortal vehicle of the irrational soul.
In some Gnostic schools, the Body of Light or Body of the Resurrection is the spiritual form attained by awakening the divine spark within and transcending the material world. This concept is central to those gnostic systems which view the physical body as a prison created by the Demiurge, while the true self is a spark of the supreme, transcendent God. Not all humans are in possession of such a spark.
In the Emerald Tablet "the Golden Body" is "the Glory of the Whole Universe". The alchemist Paracelsus called it "the astral body".
In the Hermetic Corpus, it is called "the Immortal Body" (soma athanaton).
In some mystery schools, "the Solar Body", and in Rosicrucianism, "the diamond body of the temple of God".
And so on ...
That conversation has yet to fully to unpack itself, but I thought I'd throw in some stuff here. In utilising a search engine, I found a lot of stuff thrown up which is derivative if not fanciful – a lot of opinion, but rarely based on direct reference. So I though I'd stick to search-engine generic answers, and hope that someone more critically informed might add in.
The Diamond Body
In Buddhism, the vajrakaya symbolizes an indestructible, enlightened form that transcends physical limitations and duality. It represents the pure, luminous nature of reality and the practitioner's potential to realize an immortal, subtle body through advanced meditative and tantric practices. Known as the Diamond Vehicle in Vajrayana Buddhism, the culmination of practice, achieved through vajrasattva yoga and tantric visualization. It is described as a celestial body beyond dualities, formed by purifying the physical and subtle bodies until they become transparent and luminous like crystal.
In a broader Mahayana contexts, the diamond body signifies a Buddha's indestructible state, free from corporeal needs, such as food, etc. It is closely linked to the Diamond Sutra Vajracchedika, which uses the diamond metaphor to describe wisdom that cuts through delusion and conceptual attachments.
Rainbow Body
In Tibetan: jalü or 'ja' lus, is the spiritual attainment in the Tibetan Dzogchen (Great Perfection) Tradition, wherein the physical body dissolves into pure light at the time of death. This signifies liberation from samsara.
+++
Equivalences can be drawn between the two, and from a number of other traditions:
St. Paul spoke of the spiritual body (soma pneumatikon) in 1 Corinthians 15:40.
Sufism speaks of "the most sacred body" (wujud al-aqdas) and "supracelestial body " (jism asli haqiqi).
In Vedanta, "the superconductive body."
Building on concepts by Iamblichus and Plotinus, the late Neoplatonist Proclus (5th century CE), credited as the first to speak of subtle or astral (starry) planes, posited two subtle bodies, vehicles, or 'carriers' (okhema), between spirit and the physical body. These were the augoeides okhêma, 'luminous vehicle' / 'body of light', the immortal vehicle of the rational soul, and the pneumatikon okhêma, 'pneumatic vehicle' / 'body of breath' (the indwelling vital breath pneuma) which he identified as the mortal vehicle of the irrational soul.
In some Gnostic schools, the Body of Light or Body of the Resurrection is the spiritual form attained by awakening the divine spark within and transcending the material world. This concept is central to those gnostic systems which view the physical body as a prison created by the Demiurge, while the true self is a spark of the supreme, transcendent God. Not all humans are in possession of such a spark.
In the Emerald Tablet "the Golden Body" is "the Glory of the Whole Universe". The alchemist Paracelsus called it "the astral body".
In the Hermetic Corpus, it is called "the Immortal Body" (soma athanaton).
In some mystery schools, "the Solar Body", and in Rosicrucianism, "the diamond body of the temple of God".
And so on ...